Your Social Security retirement benefit is not a flat amount or a simple percentage of your final salary. The Social Security Administration (SSA) runs your lifetime earnings through a multi-step formula to produce your primary insurance amount (PIA) — the benefit you receive at full retirement age. Here is exactly how that calculation works for 2026, with the official figures.
Step 1: Your Top 35 Years of Earnings
SSA looks at your entire covered work history and selects your highest 35 years of earnings. If you worked fewer than 35 years, the missing years are counted as zeros, which drags your average down. Each year is also capped at that year’s taxable maximum (the 2026 wage base is $184,500); earnings above the cap do not count toward your benefit.
Step 2: Indexing and AIME
Older earnings are indexed to account for wage growth across the economy, so a dollar earned in 1995 is scaled up to be comparable to recent wages. SSA then sums your 35 indexed years, divides by 420 (35 years times 12 months), and the result is your average indexed monthly earnings (AIME).
Example: suppose your indexed top-35 earnings total $2,520,000. Dividing by 420 gives an AIME of $6,000.
Step 3: Apply the 2026 Bend Points
The PIA formula is progressive — it replaces a higher share of income for lower earners. It uses two bend points that are set in the year you turn 62. For workers first eligible in 2026, the bend points are $1,286 and $7,749 (source: SSA Office of the Chief Actuary). The formula is:
- 90% of the first $1,286 of AIME, plus
- 32% of AIME between $1,286 and $7,749, plus
- 15% of AIME above $7,749.
Using our $6,000 AIME example:
- 90% of $1,286 = $1,157.40
- 32% of ($6,000 − $1,286 = $4,714) = $1,508.48
- 15% of $0 (nothing above $7,749) = $0
- PIA = $2,665.88 per month (rounded down to the next lower $0.10 per SSA rules: $2,665.80)
This PIA is what you would receive if you claim at your full retirement age.
Step 4: Full Retirement Age Adjusts the Check
Your PIA is paid in full only at full retirement age (FRA). For anyone born in 1960 or later, FRA is 67. Claiming earlier or later changes the amount:
- Claim at 62 (earliest): benefit is reduced by about 30% versus your PIA.
- Claim at FRA (67): you receive 100% of your PIA.
- Claim at 70 (latest worth waiting for): delayed retirement credits add roughly 8% per year after FRA, boosting your benefit by about 24% over your PIA.
So our $2,665.80 PIA would be roughly $1,866 at age 62 and about $3,305 at age 70.
Step 5: Annual COLA
After you start benefits, the cost-of-living adjustment (COLA) keeps pace with inflation. The 2026 COLA is 2.8%, applied to benefits starting with the December 2025 payment (received January 2026).
How Spousal and Survivor Benefits Relate
A spouse can receive up to 50% of the worker’s PIA at their own FRA, and a surviving spouse can step up to 100% of the deceased worker’s benefit. Both are derived from the same PIA figure, which is why the AIME and bend-point math matters even for non-working spouses.
A Few Practical Takeaways
- Fill in the zeros. Working a 36th or 37th year to replace a zero or a low-earning year can measurably raise your AIME.
- High earners hit a ceiling. Because earnings above the wage base do not count, two people earning $250,000 and $500,000 build the same Social Security benefit.
- The formula favors waiting. For most people in good health, delaying from 62 to 67 (or 70) produces a larger lifetime benefit.
The math has several moving parts — AIME, bend points, FRA reductions, and COLA — so the fastest way to see your own number is to estimate it directly. Run your earnings through the Social Security benefits calculator to project your monthly PIA and compare claiming ages.